You can find ten percent of any number by simply moving the decimal point one place to the left. Secondly, you can find five percent of any number by simply dividing ten percent in half. Lastly, you can find one percent of any number by simply moving the decimal point two places to the left.
So without the use of a calculator we can calculate your percentage of 25.
Ten percent of 25 would be 2.5 (we moved one place to the left). Now that we know ten percent, we can find fifty percent by simply multiplying ten percent by five.
2.5 x 5 = 12.5
Now we've found 50% of 25.
According to the first passage we can find 5% by simply dividing 10% in half.
2.5 ÷ 2 = 1.25
12.5 + 1.25 = 13.75
Now we've found 55% of 25.
Lastly, the first passage told us we can find one percent of 25 by simply moving the decimal two places to the left.
2.5 is 10% which means .25 is 1%.
.25 + .25 = .50
13.75 + .50 = 14.25
There we have it, 57% of 25 is 14.25. You can double check by simply using a calculator (57 x 25 x 100 = 14.25)
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The answer is 57.
15% of 380 = 57 25% of 210 = 52.5
2.5% of 228= 2.5% * 228= 0.025 * 228= 5.7
57 percent of 21 is 11.97
57 percent of 130 is 74.1